Load Specifications
Load data in caliber 7 x 57 R with .284 | 170gr | Sierra RN Prohunter bullet and 47 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are Alliant Reloder-26, ReloadSwiss RS 70 and Alliant Reloder-16.
Important Notice: DO NOT go below Minimum Charge or above Maximum Charge. Since we have no control over the equipment and components used, any responsibility and liability for the results achieved is rejected.
Only powders/loads that match the current filter criteria are displayed: max pressure of a load ≤ 90% of max. standardized pressure, fill rate ≥ 80% and propellant combustion ≥ 95%. Use the sliders above the tables to adjust these thresholds.
Charge: Powder weight in grains. Start with the minimum load and work up carefully.
FR (Fill Rate): Case fill as a percentage. Values above 100% mean compressed loads.
MaxP / %: Maximum chamber pressure in bar and as a percentage of the standardized maximum for this caliber.
V(0): Muzzle velocity in feet per second (fps) at the standardized barrel length.
z (Powder Burn): Estimated propellant combustion percentage at bullet exit.
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Max Load - Barrel Length: 23.62"
| Powder | Charge | FR | MaxP | % | V(0) | z |
|---|---|---|---|---|---|---|
| Accurate 3100 | <<locked>> | 98% | 41,785 psi | 85% | 2421 fps | 97.4% |
| Accurate 4350 | <<locked>> | 90% | 44,280 psi | 90% | 2477 fps | 99.2% |
| ADI AR 2208 | <<locked>> | 82% | 43,366 psi | 88% | 2382 fps | 99.3% |
| Alliant Reloder- TS 15.5 | <<locked>> | 82% | 43,279 psi | 88% | 2402 fps | 99.9% |
| Alliant Reloder-16 | <<locked>> | 90% | 43,033 psi | 87% | 2480 fps | 99.3% |
| Alliant Reloder-17 | <<locked>> | 86% | 43,178 psi | 88% | 2503 fps | 99.9% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 42,351 psi | 86% | 2493 fps | 99.9% |
| Alliant Reloder-25ᴾ | <<locked>> | 100% | 37,318 psi | 76% | 2405 fps | 96.6% |
| Alliant Reloder-26 | <<locked>> | 98% | 44,382 psi | 90% | 2598 fps | 99.2% |
| Bofors RP3 | <<locked>> | 82% | 43,279 psi | 88% | 2411 fps | 99.9% |
| Bofors RP7 | <<locked>> | 86% | 43,932 psi | 89% | 2392 fps | 96.2% |
| Hodgdon H380 | <<locked>> | 82% | 44,164 psi | 90% | 2421 fps | 98.8% |
| Hodgdon H414 | <<locked>> | 88% | 43,700 psi | 89% | 2467 fps | 96.9% |
| Hodgdon Hybrid 100V | <<locked>> | 92% | 42,699 psi | 87% | 2425 fps | 99.8% |
| Hodgdon Superformance | <<locked>> | 88% | 43,279 psi | 88% | 2487 fps | 96.2% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 35,810 psi | 73% | 1552 fps | 100% |
| IMR 4350 | <<locked>> | 90% | 44,266 psi | 90% | 2421 fps | 96.3% |
| IMR 4451 Enduron | <<locked>> | 84% | 42,815 psi | 87% | 2372 fps | 96.4% |
| IMR 4831 | <<locked>> | 90% | 42,322 psi | 86% | 2428 fps | 98.9% |
| Lovex S065 | <<locked>> | 86% | 42,395 psi | 86% | 2369 fps | 97.7% |
| Lovex S070 | <<locked>> | 88% | 42,902 psi | 87% | 2398 fps | 96.8% |
| Lovex S071ᴾ | <<locked>> | 100% | 37,144 psi | 75% | 2333 fps | 96.1% |
| Norma MRP | <<locked>> | 98% | 44,353 psi | 90% | 2559 fps | 96.9% |
| Norma URP | <<locked>> | 90% | 43,874 psi | 89% | 2467 fps | 99.1% |
| Ramshot Hunter | <<locked>> | 90% | 42,641 psi | 86% | 2457 fps | 97.5% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 36,593 psi | 74% | 1594 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 82% | 44,280 psi | 90% | 2405 fps | 97.5% |
| ReloadSwiss RS 60 | <<locked>> | 84% | 43,018 psi | 87% | 2503 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 90% | 43,874 psi | 89% | 2493 fps | 98.9% |
| ReloadSwiss RS 70 | <<locked>> | 90% | 43,439 psi | 88% | 2513 fps | 98.6% |
| Rottweil R 903 | <<locked>> | 84% | 43,468 psi | 88% | 2411 fps | 99.9% |
| Rottweil R 907 | <<locked>> | 86% | 43,932 psi | 89% | 2392 fps | 96.2% |
| Shooters World Long Rifle | <<locked>> | 86% | 42,395 psi | 86% | 2369 fps | 97.7% |
| Shooters World SW4350 | <<locked>> | 88% | 42,902 psi | 87% | 2398 fps | 96.8% |
| SNPE Vectan SP 11 | <<locked>> | 82% | 41,858 psi | 85% | 2415 fps | 99.5% |
| SNPE Vectan Tubal 5000 | <<locked>> | 82% | 42,873 psi | 87% | 2293 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 88% | 44,614 psi | 90% | 2372 fps | 97% |
| Somchem S355 | <<locked>> | 84% | 44,150 psi | 90% | 2415 fps | 99.9% |
| Somchem S365 | <<locked>> | 92% | 42,090 psi | 85% | 2474 fps | 100% |
| Somchem S385 | <<locked>> | 96% | 44,556 psi | 90% | 2461 fps | 96.4% |
| Vihtavuori N150 | <<locked>> | 84% | 42,061 psi | 85% | 2349 fps | 100% |
| Vihtavuori N160 | <<locked>> | 88% | 42,931 psi | 87% | 2418 fps | 98.8% |
| Vihtavuori N550 | <<locked>> | 88% | 42,119 psi | 85% | 2418 fps | 98.6% |
| Vihtavuori N555 | <<locked>> | 98% | 44,150 psi | 90% | 2520 fps | 99.6% |
| Winchester 6.5 StaBALL | <<locked>> | 88% | 42,554 psi | 86% | 2398 fps | 99.9% |
| Winchester 760 | <<locked>> | 88% | 43,961 psi | 89% | 2474 fps | 97% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 38,101 psi | 77% | 2523 fps | 100% |
Recommended = one of the top powders for this cartridge and bullet combination.
Start Load - Barrel Length: 23.62"
| Powder | Charge | FR | MaxP | % | V(0) | z |
|---|---|---|---|---|---|---|
| Accurate 3100 | <<locked>> | 92% | 34,171 psi | 69% | 2274 fps | 95% |
| Accurate 4350 | <<locked>> | 80% | 31,415 psi | 64% | 2221 fps | 95.9% |
| ADI AR 2208 | <<locked>> | 80% | 40,915 psi | 83% | 2339 fps | 99% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 40,799 psi | 83% | 2359 fps | 99.8% |
| Alliant Reloder-16 | 38 gr | 80% | 31,662 psi | 64% | 2231 fps | 96.1% |
| Alliant Reloder-17 | <<locked>> | 80% | 35,201 psi | 71% | 2346 fps | 98.9% |
| Alliant Reloder-23 | <<locked>> | 86% | 27,528 psi | 56% | 2156 fps | 95.8% |
| Alliant Reloder-25 | <<locked>> | 98% | 35,041 psi | 71% | 2352 fps | 95.6% |
| Alliant Reloder-26 | 46.1 gr | 88% | 31,299 psi | 63% | 2306 fps | 95% |
| Bofors RP3 | <<locked>> | 80% | 40,480 psi | 82% | 2365 fps | 99.8% |
| Bofors RP7 | <<locked>> | 84% | 41,220 psi | 84% | 2343 fps | 95.5% |
| Hodgdon H380 | <<locked>> | 80% | 41,350 psi | 84% | 2372 fps | 98.3% |
| Hodgdon H414 | <<locked>> | 84% | 38,290 psi | 78% | 2365 fps | 95.3% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 29,022 psi | 59% | 2139 fps | 96.8% |
| Hodgdon Superformance | <<locked>> | 86% | 40,335 psi | 82% | 2431 fps | 95.3% |
| Hodgdon TrailBoss | <<locked>> | 80% | 26,658 psi | 54% | 1385 fps | 100% |
| IMR 4350 | <<locked>> | 88% | 41,495 psi | 84% | 2372 fps | 95.6% |
| IMR 4451 Enduron | <<locked>> | 82% | 40,219 psi | 82% | 2323 fps | 95.7% |
| IMR 4831 | <<locked>> | 80% | 30,618 psi | 62% | 2185 fps | 95.7% |
| Lovex S065 | <<locked>> | 80% | 35,418 psi | 72% | 2234 fps | 95.8% |
| Lovex S070 | <<locked>> | 84% | 37,956 psi | 77% | 2303 fps | 95.4% |
| Lovex S071 | <<locked>> | 98% | 34,882 psi | 71% | 2287 fps | 95.3% |
| Norma MRP | <<locked>> | 94% | 38,667 psi | 78% | 2444 fps | 95.1% |
| Norma URP | <<locked>> | 80% | 31,778 psi | 64% | 2221 fps | 95.9% |
| Ramshot Hunter | <<locked>> | 84% | 35,186 psi | 71% | 2306 fps | 95.1% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 27,209 psi | 55% | 1421 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 80% | 41,524 psi | 84% | 2356 fps | 96.9% |
| ReloadSwiss RS 60 | <<locked>> | 80% | 37,449 psi | 76% | 2398 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 31,169 psi | 63% | 2234 fps | 95.4% |
| ReloadSwiss RS 70 | 42.6 gr | 82% | 33,141 psi | 67% | 2287 fps | 95.3% |
| Rottweil R 903 | <<locked>> | 80% | 38,247 psi | 78% | 2316 fps | 99.4% |
| Rottweil R 907 | <<locked>> | 84% | 41,220 psi | 84% | 2343 fps | 95.5% |
| Shooters World Long Rifle | <<locked>> | 80% | 35,418 psi | 72% | 2234 fps | 95.8% |
| Shooters World SW4350 | <<locked>> | 84% | 37,956 psi | 77% | 2303 fps | 95.4% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 39,160 psi | 79% | 2365 fps | 99.1% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 40,364 psi | 82% | 2254 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 84% | 39,436 psi | 80% | 2277 fps | 95.6% |
| Somchem S355 | <<locked>> | 80% | 39,015 psi | 79% | 2323 fps | 99.4% |
| Somchem S365 | <<locked>> | 80% | 28,456 psi | 58% | 2182 fps | 98.1% |
| Somchem S385 | <<locked>> | 94% | 41,727 psi | 85% | 2411 fps | 95.6% |
| Vihtavuori N150 | <<locked>> | 80% | 37,043 psi | 75% | 2260 fps | 99.7% |
| Vihtavuori N160 | <<locked>> | 80% | 33,040 psi | 67% | 2224 fps | 96.3% |
| Vihtavuori N550 | <<locked>> | 80% | 32,634 psi | 66% | 2228 fps | 95.9% |
| Vihtavuori N555 | <<locked>> | 84% | 27,949 psi | 57% | 2175 fps | 95.1% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 32,677 psi | 66% | 2201 fps | 98.3% |
| Winchester 760 | <<locked>> | 84% | 38,537 psi | 78% | 2369 fps | 95.4% |
| Winchester StaBALL HD | <<locked>> | 88% | 25,860 psi | 52% | 2172 fps | 95.2% |
Recommended = one of the top powders for this cartridge and bullet combination.
ᴾ possible press load - work up slowly to this load while watching for signs of excessive pressure.
This overview compares 47 powders for 7 x 57 R loaded with the .284 | 170gr | Sierra RN Prohunter. Alliant Reloder-26 delivers the highest muzzle velocity at 2,598 fps; across all powders the maximum-charge window runs from 1,552 fps to 2,598 fps. Alliant Reloder-23 gives the best case fill at 100 %, and 47 of the 47 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (340 MPa), the top charges use 73–90 %, leaving at least 10 % headroom. The 170.0 gr projectile in 0.284" calls for a 1:12.5 twist; slower twists will usually not stabilise this weight. Alliant Reloder-23, Alliant Reloder-25, Hodgdon TrailBoss reach 100 % fill or more at maximum charge, so these are compressed loads: they need a long drop tube to seat cleanly and react sensitively to the case capacity of your own brass lot. Alliant Reloder-26, ReloadSwiss RS 70, Alliant Reloder-16 rank at the top here: for 7 x 57 R with the .284 | 170gr | Sierra RN Prohunter they combine a high case fill with complete burn and sit in the upper velocity band. Always begin at the start load and work up in small increments while checking case and primer for pressure signs.